Cock-grinding machine



March 13,1934, J.-BARTO 1,951,030

COCK GRINDING MACHINE Filed April 25, 1932 I Fig. 2 2

I a U L Jnueizfor: r 1 1-1 JBarlad Fig. 3

Patented Mar. 13, 1934 UNITED STATES PATENT OFFICE COCK- GRINDING MACHINE Application April 25, 1932, SerialNo. 607,434 In Czechoslovakia October 31, 1930 V 3 Claims.

An application has been filed in Czechoslovakia October 31, 1930. v

The principal object of this invention is a proceeding of mechanical cock-grinding by which cocks of all kinds may be readily ground to make them tight.

A further object of the invention is to provide a cock-grinder by which the cocks may be very rapidly and efiiciently ground.

Further objects and advantages will be made evident hereinafter.

Referring to the drawing which is for illustrative purposes only,

Fig. 1 is a diagrammatic view showing the method of mechanical cock-grinding which has been used until now;

Fig. 2 is a diagrammatic View showing the new proceeding of grinding the cocks;

Fig. 3 is a schematic vertical longitudinal sec- '20 tional view through the new cock-grinder according to the invention.

The differences between the methods of grinding cocks used until now and the new one introduced by the present invention, are as follows:

(1) In all the known proceedings of mechanical cock-grinding both parts of the cock, while being ground, move into one another and vice versa along the same axis which their conical surfaces have constantly in common and which does not change its position.

In the new method according to the invention, the conical surfaces of the two parts have not a common axis and both parts of the cock,

while being ground, move in and out along some contact line of the two conical surfaces, and these contact lines change irregularly at each movement into one another of the worked parts of the cock.

(2) In the known proceedings of mechanical cock-grinding all movements of the parts ground are constrained.

In the new process according to the present invention, only one of the parts to be ground has a constrained movement, viz. a rotary movement in one direction as well as an intermittent movement up and down the axis of rotation, ;whereas the other part of the cock, in the depicted case the cock-body, has not a constrained movement and is freely movable in all directions except that along the axis of its conical surface. (3) In the known proceedings of mechanical j cock-grinding the whole conical surfaces always grind one another at each contact, and do so up to the conclusion of their movement into one another.

In the new proceeding of the invention only portions of the conical surfaces adjoining the contact line grind one another at each contact; 50 the grinding takes place from the very beginning of the movement into one another and continues up to the conclusion of the reverse movement. In this way are made even the declinations of the wavy touching-line from the ideal straight line (indicated in Figs. 1 and 2 by wavy lines) which does not take place inthe known proceedings of cock-grinding.

(4) In the known proceedings of mechanical cock-grinding both parts of the cock to be ground are turned at each contact by the same angle which results in the forming of a slightly undulating conical surface; this is the main reason for the fact that the cooks ground mechanically by the known methods must be finished by hand grinding in order to attain adequate tightness.

In the mechanical cock-grinding according to the invention that part which has the constrained movement (in Fig. 2 the cock-key) carries along the other freely movable part of the cock (in this case the cock-body), when the friction between them is suihciently increased; this depends on the quality of the portions of the conical surfaces which occasionally touch each other as well as of the emery and oil between them. As these conditions are different at each contact, the freely movable part of the cock is always turned by a different angle and no undulating conical surface can therefore arise.

(5) By the new method of mechanical cockgrinding one can thus achieve almost ideal and exactly corresponding circular conical surfaces of both ground parts, and consequently also a tightness which surpasses both in degree and duration that of the cooks ground in the known manner; for even after the wearing out of the conical surfaces which is unavoidable after a certain period of time, the generating straight lines of both conical surfaces remain straight, and therefore the tightness is satisfactory even when, owing to the wear, the cock-key protrudes a little from the cock-body. On the other hand the cooks ground in the known manner, which even after grinding have the generating straight lines of both conical surfaces irregularly undulating, become considerably loose even after a small wear. This circumstance has in a considerable degree prevented the more extensive use of cocks.

In grinding the cocks according to this invention excellent tightness is achieved without thumbs.

the finishing touch of manual work; it is not necessary to disconnect the parts of the cock and inspect them in the course of the grinding, which is indispensable in the known proceedings of mechanical cock-grinding. Thus, according to this invention, cocks are ground not only better but also much faster.

By the cock-grinder of this invention, one type of which is schematically drawn in Fig. 3, the constrainedly moved part of the cock is the cockkey 2, and the freely movable part is the cockbody 1; it might, of course, be arranged the other way.

The cock-key 2 is fixed on a vertical shaft 4 and is driven by a horizontal shaft 5 through the medium of the frictional propulsion 6, 7 and of cog-wheels 8, 9. The lower end of the shaft 4 turns around freely in a bearing 10 at the upper end of a rod 10 which is widened at this end and provided with an opening. Through this opening passes the shaft 5 and in it is also placed a thumb-plate 11 which is fixed on the shaft 5. Adjacent to the thumb-plate 11 is a roller 12 rotatably mounted between disks 13, 14, which cover the opening of the rod at opposite sides thereof and are connected with the rod. The roller 12 is pressed against the thumb-plate 11 by a spring 15, the pressure of which is adjusted through a regulating nut 16.

When the shaft 5 and the thumb-plate or cam 11 connected with it, are rotating, the thumb presses the rod 10 downwardly which carries with it the shaft 4, and the spring 15 is compressed; as soon as the thumb in its further movement swings upwardly in a direction away from the roller 12, the said rod 10 as well as the shaft 4 and the cock-key 2 are pressed upwards by the spring 15 whereby the cock-key strikes elastically against the cock-body 1 and carries the .same along owing to the friction of the contacting surfaces until the thumb again swings downwardly and causes a downward movement of the cock-key and separates the two parts of the cock. The pressure of the spring 15 and also the striking force of the cock-key against the cock-body may be adjusted by the regulating nut 16. The number of the touchings of the two parts of the cock in the course of one revolution of the shaft 5 depends on the number of The revolving speed of the shaft 4 is regulated by shifting of the friction cylinder 6 on the shaft 5.

The cock-body 1 is in this case fastened on part 17 of the ball-and-socket joint. The other parts 18, 19 of this joint are so bedded in the frame that the ball-and-socket joint and with in a position in which the conical surfaces touch and rub along the common contact line. I wish it understood that various modifications may be resorted to without departing from the spirit of the invention and the scope of the adjoining claims.

I claim:

1. In acock-grinding machine, a table, a ball and socket joint associated with the table, a support for a cock-body carried by said joint and. permitting universal tilting movement of a cockbody, a shaft rotatably mounted and extending through the joint and support, said shaft being adapted to support a cock-key through the body and means for reciprocating the shaft and key and at the same time imparting rotary motion thereto.

2. In a cock-grinding machine, a table, a ball and socket joint associated with the table, a support for a cock-body carried by said joint and permitting universal tilting movement of a cockbody, a driven shaft having an upper section rotatably and slidably mounted with its upper portion journaled through the joint and body support and adapted to support a cock-key in position to extend through a cock-body, a lower shaft section, a coupling connecting the upper end of the lower. shaft section to the lower end of the upper shaft section to permit rotation of the upper shaft section relative to the lower shaft section and cause reciprocation of the sections as a unit and means to impart rotation to the upper shaft section having an element serving to impart reciprocation to the shaft.

3. In a cock-grinding machine, a table, a ball and socket joint associated with the table, a support for a cock-body carried by said joint and. permitting universal tilting movement of a cockbody, a driven shaft having an upper section rotatably and slidably mounted with its upper portion journaled through the joint and body support and adapted to support a cock-key in position to extend through a cock-body, a lower shaft section, a coupling connecting the upper end of the lower shaft section to the lower end of the upper shaft section to permit rotation of the upper shaft section relative to the lower shaft section and cause reciprocation of the sections as a unit, a drive shaft rotatably mounted with a portion extending through an elongated passage in the coupling, a roller in said coupling, a cam carried by said drive shaft and engaging said roller to impart downward movement to the lower shaft section as the drive shaft rotates, a spring yieldably resisting such movement, a counter shaft, means for transmitting rotary motion from the drive shaft to said counter shaft and controlling speed of the driven shaft, and means for transmitting rotation from said counter shaft to the upper shaft section.

JOSEPH BARTOS. 

